drm/i915: Don't look at staged config crtc when changing DRRS state

The function intel_dp_set_drrs_state() would decide which pipe to
downclock based on the staged config for the given connector. However,
the result of that function is immediate, and it uses input values from
crtc->config, so it should be looking at the current crtc instead.
Signed-off-by: NAnder Conselvan de Oliveira <ander.conselvan.de.oliveira@intel.com>
Signed-off-by: NDaniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/i915/intel_dp.c

@@ -5000,7 +5000,7 @@ static void intel_dp_set_drrs_state(struct drm_device *dev, int refresh_rate)
 
 	dig_port = dp_to_dig_port(intel_dp);
 	encoder = &dig_port->base;
-	intel_crtc = encoder->new_crtc;
+	intel_crtc = to_intel_crtc(encoder->base.crtc);
 
 	if (!intel_crtc) {
 		DRM_DEBUG_KMS("DRRS: intel_crtc not initialized\n");